sedimentary

Red Jasper

Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)

Hardness: 6.5–7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Hexagonal (Trigonal, microcrystalline); Cleavage: None (Conchoidal fracture); Specific gravity: 2.58–2.91.

Hardness: 6
Color: Brick red to brownish-red
Luster: Vitreous to dull

Identified March 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in hydrothermal or sedimentary environments, where iron impurities provide the red pigmentation. It is often found in prehistoric iron-ore deposits and Precambrian formations.

Uses & applications

Used primarily in lapidary work for jewelry, cabochons, beads, and decorative carvings. Industrially, it has been used for mortar and pestles due to its hardness, and historically as the 'mother of all stones' for amulets.

Geological facts

Red Jasper has been used by ancient civilizations for thousands of years; Egyptians used it for amulets representing the blood of Isis. It is also mentioned in the Bible as one of the stones in the High Priest's breastplate.

Field identification & locations

Identify in the field by its opaque red color, smoothness after being tumbled (natural or river-worn), and its ability to scratch glass. Common locations include India, Brazil, Madagascar, USA (Oregon, Idaho), and Russia.

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